[Xapian-discuss] Phrase search performance

[Alex Deucher]

On 2/20/06, David Levy <dvid.levy at gmail.com> wrote:
> Hi Alex,
>
>  what is your hardware ?

The database is on a SAN volume shared via NFS on 100 Mbps Ethernet. 
The server running the query is a linux p4 box with 256 MB ram.

>  How many documents do you have in your flint database ?

~100,000 in the database in question.

>
>  wow .. I am complaining about search time > 0.5s and you have search time >
> 1 min !
>
>  I don't use phrase searching but that sounds really bad performances.
>
>  Regards
>
>
>
>
> On 2/20/06, Alex Deucher <alexdeucher at gmail.com> wrote:
> >
> > Is there any way to speed up phrase searches?  What sort of
> > performance should I expect?  Currently when I search against a 5.3 GB
> > flint database it takes 4.5 minutes for a simple 2 word phrase.  Is
> > that reasonable performance?  I've seen some other threads about
> > xapian phrase performance, but none seem to indicate what reletively
> > "normal" performance should be and I'm not sure what I should expect.
> > I'm using the perl interface to xapian 0.9.2.  I'm building my own
> > Query objects rather than using QueryParser since we use ':' as part
> > of our field prefix.  What popped out at me was that my query looks
> > like:
> >
> > Xapian::Query((FIELD:term1 PHRASE 2 FIELD:term2))
> >
> > while QueryParser's looks like:
> >
> > Xapian::Query((term1(pos=1) PHRASE 2 term2(pos=2)))
> >
> > where is the position information coming from and how do I add it to
> > my query?  Will it help or is it irrelevant?  The query object (at
> > least the perl interface) only allows me to build queries of the form:
> > ("term")
> > or
> > (OP, "term", "term"...)
> > or
> > (OP, query, query...)
> >
> > I can't seem to specify position.
> >
> >
> > Thanks,
> >
> > Alex
> >
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> >
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> >
>
>
>
> --
> David LEVY {selenium}
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>